Main Title |
Contourites in Lake Superior. |
Author |
Johnson, T. C. ;
Carlson, T. W. ;
Evans, J. E. ;
|
CORP Author |
Minnesota Univ., Minneapolis. Dept. of Geology and Geophysics.;Environmental Research Lab.-Duluth, MN. |
Year Published |
1980 |
Report Number |
EPA-R-805172; EPA-600/J-80/447; |
Stock Number |
PB84-142447 |
Additional Subjects |
Sediments ;
Water flow ;
Lake Superior ;
Geological sedimentation ;
Seismic reflection method ;
Profiles ;
Sands ;
Sampling ;
Kewaenaw Peninsula ;
Particle size ;
Reprints ;
Contourites
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB84-142447 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
9p |
Abstract |
Contour currents influence sedimentation in an area 15 km wide and 65 km long at the base of the slope off the Keweenaw Peninsula in Lake Superior, northwestern Michigan. Seismic-reflection profiles (3.5 kHz) from this area show distinct wavy reflectors in a scoured trough at a depth of 200 m at the base of the slope, hyperbolic echoes adjacent to the trough, and overlapping echos farther lakeward. These acoustic features are identical to those in marine environments where contourites are deposited. Box cores from the lakeward margin of this area contain what appeared to be contourites: irregular, thin sand layers with sharp upper and lower contacts, interbedded with sandy clay. This is the first report of contourites in a lacustrine environment. |
Availability Notes |
Pub. in Geology 8, p437-441 1980. |
NTIS Title Notes |
Journal article. |
Title Annotations |
Reprint: Contourites in Lake Superior. |
PUB Date Free Form |
c1980 |
Category Codes |
8G; 8H; 48F; 48G |
NTIS Prices |
Not available NTIS |
Primary Description |
600/03 |
Document Type |
NT |
Cataloging Source |
NTIS/MT |
Control Number |
409018058 |
Origin |
NTIS |
Type |
CAT |